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"Our investigation indicates that the developers of these infected apps are not to blame, but are more likely victims themselves," Palo Alto Networks said in a blog post. "We believe it is most likely that the app developers’ development platforms were infected with malware that searches for HTML pages and injects malicious content at the end of the HTML pages it finds."

Any app featured in the iOS store has gone through an in-depth examination - the thorough vetting process blocks "widespread malware infection" among iPhone users, but malicious software targeting iOS-based systems is on the rise, according to a report from SIXGILL last month.

Applications infected with malware are becoming problematic for app developers and consumers. Cybersecurity experts have warned smartphone owners to refrain from downloading third-party apps from unofficial sources, but the presence of malicious apps in official stores make it difficult for users to identify which ones can be trusted.